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More tests are to be carried out on the body of a teenage girl who died suddenly in Oxford.

Martha Fernback suffered a heart attack at Hinksey Park at the weekend. It's thought the 15 year old had taken a form of ecstasy. A post-mortem examination proved inconclusive. A 17-year-old boy, who was arrested, has been released on bail.

Martha Fernback, 15, died at an Oxford community centre over the weekend Credit: Thames Valley Police

A post-mortem is due to take place today after a 15-year-old girl suddenly died in Oxford. Martha Fernback suffered a heart attack while at the South Oxford Community Centre at Hinksey Park on Saturday and was later pronounced dead in hospital.

Martha had taken a substance earlier that day which she believed was MDMA, better known as the drug ecstasy. Thames Valley Police are investigating and say the results of toxicology and histology tests will take several weeks.

A 17-year-old boy from the Oxford area has been arrested on suspicion of possession with intent to supply a controlled drug.

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A 17-year-old boy from Oxford has been arrested on suspicion of possession with intent to supply a controlled drug after a 15-year-old girl died suddenly at a community centre. It's thought Martha Fernback may have taken MDMA, widely known as the drug Ecstasy.

Det Insp Brendan Murray from Thames Valley Police said: 'Firstly our thoughts are very much with Martha’s family, who have been left devastated and distraught by her death. Following our initial enquiries we now understand Martha had taken a substance earlier that day which she believed was MDMA.

'It would be wrong to speculate on what this substance was or what caused her death, as the investigation is still at an early stage. A full post-mortem examination will be carried out tomorrow, which will include toxicology and histology tests.'

The family of a 15-year-old have described her as an 'extraordinary, effervescent human being' after she died suddenly at a community centre yesterday. It's thought Martha Fernback suffered a heart attack, but her death is being treated as unexplained by Thames Valley Police who are investigating.

The tribute reads: 'Our beautiful girl was taken away from us yesterday, she was the most extraordinary, effervescent human being and all her family and friends felt so privileged to have known her.

'We are all utterly devastated and have sought such comfort in the beautiful condolences we have received from everyone.'

The incident happened at 1.25pm yesterday at South Oxford Community Centre in Lake Street, Oxford. Martha was taken to the John Radcliffe Hospital in Oxford, but she sadly died.